Air-conditioning system and air conditioner having same

ABSTRACT

Disclosed is an air-conditioning system, including: a compressor; a first pipeline in communication with the compressor; a second pipeline also in communication with the compressor, the first pipeline and the second pipeline being independently disposed; an evaporative condenser disposed in the first pipeline and the second pipeline, refrigerant in the first pipeline and refrigerant in the second pipeline being separately capable of performing heat exchange with the evaporative condenser; a first liquid separator disposed in the first pipeline, the first liquid separator having an outlet in communication with the compressor; and a second liquid separator disposed in the second pipeline, the second liquid separator having an outlet in communication with the compressor, and the first liquid separator and the second liquid separator being disposed adjacent to each other. Also disclosed is an air conditioner having the air-conditioning system.

TECHNICAL FIELD

The present disclosure relates to the technical field ofair-conditioning equipment, and in particular, to an air-conditioningsystem and an air conditioner having the same.

BACKGROUND

As the requirements of scientific research and production for lowtemperature are becoming higher, the lowest evaporating temperatureobtained by the double-stage compression refrigeration device employingmedium-temperature refrigerant is also limited by a series of problemscaused by too low evaporation pressure. For example, when the pressuredifference between the evaporator pressure and the outside pressureincreases, the possibility that the air infiltrates into the systemincreases, which will affect the normal operation of the system. Thesuction specific volume is large, and the gas actually sucked into thecylinder is reduced, which causes an increase of the size of thecylinder. Therefore, when a low evaporation temperature is required, alow-temperature refrigerant should be used. However, the condensationtemperature of the low-temperature refrigerant is required to be lower,and the refrigerant cannot be condensed into liquid by ordinary watercooling and air cooling. A kind of artificial cold source is required tocondense the low-temperature refrigerant, accordingly, a cascadedrefrigeration cycle adopting two kinds of refrigerants occurs. However,multiple compressors are employed to realize the cascaded refrigerationcycle in the existing technology, which causes a problem of an increaseof the cost of implementing a cascade refrigeration cycle in theexisting technology.

SUMMARY

The main objective of the present disclosure is to provide anair-conditioning system and an air conditioner having the same, so as tosolve a problem of a high cost of manufacturing the air-conditioningsystem in the prior art.

In order to achieve the above objective, according to one aspect of thepresent disclosure, an air-conditioning system is provided, including acompressor; a first pipeline, a second pipeline, an evaporativecondenser, a first liquid separator, and a second liquid separator; thefirst pipeline is in communication with the compressor; the secondpipeline is in communication with multiple compressors, and the firstpipeline and the second pipeline are arranged independently; theevaporative condenser is provided in the first pipeline and the secondpipeline, and refrigerant in the first pipeline and refrigerant in thesecond pipeline perform heat exchange with the evaporative condenserrespectively; the first liquid separator is arranged in the firstpipeline, and an outlet of the first liquid separator is incommunication with the compressor; the second liquid separator isarranged in the second pipeline, and an outlet of the second liquidseparator is in communication with the compressor; and the first liquidseparator is disposed adjacent to the second liquid separator.

Further, the compressor includes multiple cylinders, and the multiplecylinders are configured to work independently.

Further, the multiple cylinders include a first cylinder; the outlet ofthe first liquid separator is in communication with a suction port ofthe first cylinder; a first end of the first pipeline is incommunication with a discharge port of the first cylinder; and a secondend of the first pipeline is in communication with an inlet of the firstliquid separator.

Further, the air-conditioning system further includes a condenser; thecondenser is arranged in the first pipeline; an inlet of the condenseris in communication with the discharge port of the first cylinder; anoutlet of the condenser is in communication with a first inlet of theevaporative condenser; and a first outlet of the evaporative condenseris in communication with the inlet of the first liquid separator.

Further, the air-conditioning system further includes a first throttlevalve; the first throttle valve is arranged in the first pipeline andlocated between the evaporative condenser and the condenser.

Further, the multiple cylinders further include a second cylinder; theoutlet of the second liquid separator is in communication with a suctionport of the second cylinder; a first end of the second pipeline is incommunication with a discharge port of the second cylinder; and a secondend of the second pipeline is in communication with an inlet of thesecond liquid separator.

Further, the air-conditioning system further includes an evaporator; theevaporator is arranged in the second pipeline; an inlet of theevaporator is in communication with a second outlet of the evaporativecondenser; and an outlet of the evaporator is in communication with theinlet of the second liquid separator.

Further, the air-conditioning system further includes a second throttlevalve; the second throttle valve is arranged in the second pipeline andis located between the evaporative condenser and the evaporator.

Further, a volume ratio of the second cylinder to the first cylinder isT1, wherein 0.15≤T1≤0.4.

Further, a diameter ratio of the suction port of the second cylinder andthe suction port of the first cylinder is T2, wherein 0.7≤T2≤0.9.

Further, a height ratio of the second cylinder to the first cylinder isT3, wherein 0.75≤T3≤0.95.

Further, an effective volume ratio of the first liquid separator to thesecond liquid separator is T4, wherein 2.5≤T4≤6.

According to another aspect of the present disclosure, the presentdisclosure provides an air conditioner including the air-conditioningsystem above.

In the technical solution of the air-conditioning system of the presentdisclosure, the first pipeline and the second pipeline are providedindependently; the first pipeline and the second pipeline arerespectively in communication with the same one compressor; and a firstliquid separator and a second liquid separator are arranged in the firstpipeline respectively. The air-conditioning system can realize a cascaderefrigeration cycle. Since only one compressor is employed in thesystem, the cost of manufacturing the air-conditioning system iseffectively saved.

BRIEF DESCRIPTION OF DRAWINGS

The accompanying drawings attached to the specification form a part ofthe disclosure and are intended to provide a further understanding ofthe present disclosure. The illustrative embodiments of the presentdisclosure and the description thereof are used for explanations of thepresent disclosure, but not intended to limit the present disclosureimproperly. In the accompanying drawings:

FIG. 1 is a structural schematic diagram illustrating anair-conditioning system according to an embodiment of the presentdisclosure;

FIG. 2 is a structural schematic diagram of a compressor according to afirst embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a compressor according to asecond embodiment of the present disclosure.

Wherein, the drawings include following reference signs:

-   -   1. low-temperature discharge pipe; 2. high-temperature discharge        pipe;    -   10. compressor; 11. first cylinder; 12. second cylinder;    -   20. first pipeline; 30. second pipeline; 40. evaporative        condenser; 51. first liquid separator; 52. second liquid        separator; 61. condenser; 62. first throttle valve; 63.        evaporator; 64. second throttle valve.

DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS

It should be noted that the embodiments in the present disclosure andthe features in the embodiments can be combined with each other if noconflicts occur. The disclosure will be described in detail below withreference to the accompanying drawings in combination with theembodiments.

It should be noted that terms used herein are only for the purpose ofdescribing specific embodiments and not intended to limit the exemplaryembodiments of the disclosure. The singular of a term used herein isintended to include the plural of the term unless the context otherwisespecifies. In addition, it should also be appreciated that when terms“include” and/or “comprise” are used in the description, they indicatethe presence of features, steps, operations, devices, components and/ortheir combination.

It should be noted that the terms “first”, “second”, and the like in thedescription, claims and drawings of the present disclosure are used todistinguish similar objects, and are not necessarily used to describe aspecific order or sequence. It should be appreciated that such terms canbe interchangeable if appropriate, so that the embodiments of thedisclosure described herein can be implemented, for example, in an orderother than those illustrated or described herein. In addition, the terms“comprise”, “have” and any variations thereof, are intended to cover anon-exclusive inclusion, for example, a process, a method, a system, aproduct, or a device that includes a series of steps or units, which isnot necessarily limited to those steps or units explicitly listed, butcan include other steps or units that are not explicitly listed orinherent to such a process, a method, a product or a device.

For convenience of description, spatially relative terms such as“above”, “over”, “on a surface of”, “upper”, etc., may be used herein todescribe the spatial position relationships between one device orfeature and other devices or features as shown in the drawings. Itshould be appreciated that the spatially relative term is intended toinclude different directions during using or operating the device otherthan the directions described in the drawings. For example, if thedevice in the drawings is inverted, the device is described as thedevice “above other devices or structures” or “on other devices orstructures” will be positioned “below other devices or structures” or“under other devices or structures”. Thus, the exemplary term “above”can include both “above” and “under”. The device can also be positionedin other different ways (rotating 90 degrees or at other orientations),and the corresponding description of the space used herein isinterpreted accordingly.

Now, the exemplary embodiments of the disclosure will be furtherdescribed in detail with reference to the accompanying drawings.However, these exemplary embodiments can be implemented in manydifferent forms and should not be construed as only limited to theembodiments described herein. It should be appreciated that theembodiments are provided to make the present disclosure disclosedthoroughly and completely, and to fully convey the concepts of theexemplary embodiments to those skilled in the art. In the accompanyingdrawings, for the sake of clarity, the thicknesses of layers and regionsmay be enlarged, and a same reference sign is used to indicate a samedevice, thus the description thereof will be omitted.

With reference to FIGS. 1-3, according to an embodiment of the presentdisclosure, an air-conditioning system is provided.

As shown in FIG. 1, the air-conditioning system includes a compressor10, a first pipeline 20, a second pipeline 30, an evaporative condenser40, a first liquid separator 51 and a second liquid separator 52. Thefirst pipeline 20 is in communication with the compressor 10, and thesecond pipeline 30 is in communication with multiple compressors 10. Thefirst pipeline 20 and the second pipeline 30 are arranged independently,and the evaporative condenser 40 is provided in the first pipeline 20and the second pipeline 30. The refrigerant in the first pipeline 20 andthe refrigerant in the second pipeline 30 can perform heat exchange withthe evaporative condenser 40 respectively. The first liquid separator 51is arranged in the first pipeline 20, and an outlet of the first liquidseparator 51 is in communication with the compressor 10. The secondliquid separator 52 is arranged in the second pipeline 30, and an outletof the second liquid separator 52 is in communication with thecompressor 10. The first liquid separator 51 is disposed adjacent to thesecond liquid separator 52.

In this embodiment of the air-conditioning system, the first pipelineand the second pipeline are provided independently; the first pipelineand the second pipeline are respectively in communication with the sameone compressor; and the first liquid separator and the second liquidseparator are arranged in the first pipeline respectively. Theair-conditioning system can realize a cascade refrigeration cycle. Sinceonly one compressor is employed in the system, the cost of manufacturingthe air-conditioning system is effectively saved.

The compressor 10 includes multiple cylinders, and the multiplecylinders work independently. Such an arrangement enables theair-conditioning system to be adaptive for compressing differentrefrigerants, thereby improving practicability and reliability of thecompressor.

Specifically, the multiple cylinders include a first cylinder 11. Anoutlet of the first liquid separator 51 is in communication with asuction port of the first cylinder 11. The first end of the firstpipeline 20 is in communication with the discharge port of the firstcylinder 11, and the second end of the first pipeline 20 is incommunication with the inlet of the first liquid separator 51. Such anarrangement enables the first pipeline 20, the first cylinder 11 and thefirst liquid separator 51 to form a complete circulation loop, therebyeffectively improving the reliability and the stability of the pipelinesystem.

The air-conditioning system further includes a condenser 61 and a firstthrottle valve 62. The condenser 61 is arranged in the first pipeline20. The inlet of the condenser 61 is in communication with the dischargeport of the first cylinder 11. The outlet of the condenser 61 is incommunication with the first inlet of the evaporative condenser 40, andthe first outlet of the evaporative condenser 40 is in communicationwith the inlet of the first liquid separator 51. The first throttlevalve 62 is arranged in the first pipeline 20 and located between theevaporative condenser 40 and the condenser 61. Such an arrangement caneffectively improve the reliability of the air-conditioning system.

Further, the multiple cylinders further include a second cylinder 12.The outlet of the second liquid separator 52 is in communication withthe suction port of the second cylinder 12, the first end of the secondpipeline 30 is in communication with the discharge port of the secondcylinder 12; and the second end of the second pipeline 30 is incommunication with the inlet of the second liquid separator 52. Such anarrangement enables the second pipeline 30, the second cylinder 12 andthe second liquid separator 52 to form an enclosed circulation loop, andmakes the circulation loop formed by the second pipeline 30 and thecirculation loop formed by the first pipeline 20 independent of eachother, thereby improving the practicality and the reliability of theair-conditioning system.

Further, the air-conditioning system further includes an evaporator 63and a second throttle valve 64. The evaporator 63 is arranged in thesecond pipeline 30. The inlet of the evaporator 63 is in communicationwith the second outlet of the evaporative condenser 40. The outlet ofthe evaporator 63 is in communication with the inlet of the secondliquid separator 52. The second throttle valve 64 is arranged in thesecond pipeline 30 and is located between the evaporative condenser 40and the evaporator 63. Preferably, the volume ratio of the secondcylinder 12 to the first cylinder 11 is T1, where 0.15≤T1≤0.4. Thediameter ratio of the suction port of the second cylinder 12 and thesuction port of the first cylinder 11 is T2, where 0.7≤T2≤0.9. Theheight ratio of the second cylinder 12 to the first cylinder 11 is T3,where 0.75≤T3≤0.95. The effective volume ratio of the first liquidseparator 51 to the second liquid separator 52 is T4, where 2.5≤T4≤6.Such an arrangement can effectively improve the performance theair-conditioning system.

The air-conditioning system of the above embodiment can also be appliedin the field of air conditioner technology, that is, an air conditioneris provided. The air conditioner includes an air-conditioning system,and the air-conditioning system is one of the air-conditioning systemsdisclosed in the foregoing embodiments. The air-conditioning systemincludes a compressor 10, a first pipeline 20, a second pipeline 30, anevaporative condenser 40, a first liquid separator 51 and a secondliquid separator 52. The first pipeline 20 is in communication withcompressor 10, and the second pipeline 30 is in communication withmultiple compressors 10. The first pipeline 20 and the second pipeline30 are arranged independently, and the evaporative condenser 40 isprovided in the first pipeline 20 and in the second pipeline 30. Therefrigerant in the first pipeline 20 and the refrigerant in the secondpipeline 30 can perform heat exchange with the evaporative condenser 40respectively. The first liquid separator 51 is arranged in the firstpipeline 20, and the outlet of the first liquid separator 51 is incommunication with the compressor 10. The second liquid separator 52 isdisposed in the second pipeline 30, and the outlet of the second liquidseparator 52 is in communication with the compressor 10. The firstliquid separator 51 is disposed adjacent to the second liquid separator52.

According to this embodiment, in the air-conditioning system, the firstpipeline and the second pipeline are provided independently; the firstpipeline and the second pipeline are respectively in communication withthe same one compressor; and the first liquid separator and the secondliquid separator are arranged in the first pipeline respectively. Theair-conditioning system can realize a cascade refrigeration cycle. Sinceonly one compressor is employed in the system, the cost of manufacturingthe air-conditioning system is effectively saved.

Specifically, the cascaded refrigeration cycle generally includes two orthree independent refrigeration circulations, which are referred to as ahigh temperature portion and a low temperature portion respectively.Each of these independent refrigeration circulations is a completesingle-stage or two-stage compression refrigeration system, and the twoportions are related by the same one evaporative condenser.Conventionally the independent systems of the two portions respectivelyuse two compressors, which results in a complicated structure of thewhole system. In this disclosure, a compressor with one unit and doublerefrigerants is provided. The upper cylinder and the lower cylinder ofthe compressor can participate in two refrigeration circulationsrespectively, and function as two compressors. In this embodiment, thesecond cylinder is disposed above the first cylinder.

The upper first cylinders of the twin cylinder compressor independentlycomplete the compression processes of the two refrigeration circulationsrespectively, and the compressor with one unit and double refrigerantssimplifies the cascaded circulation system. In order to prevent thesucked gas from carrying liquid, the two cylinders need to be connectedto the liquid separator component separately. The first cylinder is ahigh-temperature refrigerant cylinder. After flowing through the firstliquid separator and entering the first cylinder, the high-temperaturerefrigerant is compressed, and then discharged into an intermediatecavity of the upper flange, and finally discharged out of thehigh-temperature refrigerant discharge pipe 2. The second cylinder is alow-temperature refrigerant cylinder. After flowing through the firstliquid separator and entering the second cylinder, the low-temperaturerefrigerant is compressed, and then discharged into the housing of thecompressor directly through the lower flange, and finally discharged outof the low-temperature refrigerant discharge pipe 1. The dischargetemperature of the low-temperature refrigerant is lower, which takes aneffect on lowering the temperature of the motor.

The volume ratio of the second cylinder to the first cylinder rangesfrom 0.15 to 0.4. In order to prevent the volumetric efficiency beingaffected by too large suction ports, the high ratio of the secondcylinder to the first cylinder ranges from 0.75 to 0.95. It can befurther determined that the diameter ratio of the suction port of thesecond cylinder to the suction port of the first cylinder ranges from0.7 to 0.9. Such an arrangement can further improve the reliability ofthe sealing inside the pump body.

When operating in the system with double refrigerants, the evaporativecondenser acts as an evaporator of the high-temperature refrigerant;after flowing through the first liquid separator and entering thehigh-temperature refrigerant cylinder, the high-temperature refrigerantat a low-temperature and low-pressure state is compressed and dischargedinto the inner cavity of the lower flange, then is discharged from thehigh-temperature discharge pipe into the condenser and then the throttlevalve, and finally flows back to the evaporative condenser, therebycompleting a circulation cycle of the high-temperature refrigerant.After the high-temperature refrigerant circulates for a period of time,the low-temperature refrigerant begins to circulate. After thelow-temperature refrigerant from the evaporator flows through the secondliquid separator and enters the low-temperature refrigerant cylinder,the refrigerant is compressed and discharged from the discharge port ofthe upper flange into the inner cavity of the compressor. The effectivevolume ratio of the first liquid separator to the second liquidseparator ranges from 2.5 to 6.0. The discharge temperature of thelow-temperature refrigerant is lower, which takes an effect on loweringthe temperature of the compressor motor. The low-temperature refrigerantflows through the low-temperature refrigerant discharge pipe and entersthe evaporative condenser, then enter the throttle valve, and finallyflows back to the evaporator, thereby completing a circulation cycle ofthe low-temperature refrigerant.

A second liquid separator is provided independently at the suction inletof the low-temperature refrigerant cylinder. The inner cavity of thelower flange is used as a high-temperature refrigerant discharge cavity.A high-temperature refrigerant discharge port is independently disposedin the lower flange and is in communication with the high-temperaturerefrigerant discharge pipe. The sealing distances between the partsinside the pump body are ensured to be sufficient, and the firstcylinder and the second cylinder can be independently compressed. FIG. 3is a top view of the compressor with one unit and double refrigerants.As far as the appearance is concerned, the compressor is provided withtwo liquid separators with different specifications corresponding to thehigh-temperature refrigerant discharge pipe and the low-temperaturerefrigerant discharge pipe. The low-temperature refrigerant isdischarged into the housing of the compressor first, which takes aneffect on lowering the temperature of the compressor motor.

FIG. 1 is a principle diagram of the system using the compressor withone unit and double refrigerants. Compared with the traditional cascadedrefrigeration system, two independent refrigeration circulations arerelated through the evaporative condenser, and also through thecompressor with double refrigerants; the evaporative condenser acts asan evaporator of the high-temperature refrigerant; after flowing throughthe first liquid separator and entering the high-temperature refrigerantcylinder, the high-temperature refrigerant at the low-temperature andlow-pressure state is compressed and discharged into the inner cavity ofthe lower flange, then is discharged from the high-temperature dischargepipe into the condenser and the throttle valve, and finally flows backto the evaporative condenser, thereby completing a circulation cycle ofthe high-temperature refrigerant. After the high-temperature refrigerantcirculates for a period of time, the low-temperature refrigerant beginsto circulate. After the low-temperature refrigerant from the evaporatorflows through the second liquid separator and enters the low-temperaturerefrigerant cylinder, the refrigerant is compressed, and discharged fromthe discharge port of the upper flange into the inner cavity of thecompressor. The discharge temperature of the low-temperature refrigerantis lower, which takes an effect on lowering the temperature of thecompressor motor. The low-temperature refrigerant flows through thelow-temperature refrigerant discharge pipe, and enters the evaporativecondenser and the throttle valve, and finally flows back to theevaporator, thereby completing a circulation cycle of thelow-temperature refrigerant.

In addition to the above description, it also should be noted that “oneembodiment”, “another embodiment”, “an embodiment” and the like in thedescription refer to that a specific feature, a structure or acharacteristic described in combination with the embodiment is includedin at least one embodiment generally described in the presentdisclosure. The same expression in various locations in thespecification does not necessarily refer to the same embodiment.Furthermore, when a specific feature, a structure, or a characteristicis described in combination with any embodiments, what is claimed isthat other embodiments which are combined to implement such a feature, astructure, or a characteristic are also included in the scope of thepresent disclosure.

In the above embodiments, the descriptions of the various embodimentshave different emphases, and any portions that are not detailed in acertain embodiment can be seen in the related descriptions of otherembodiments.

The above descriptions are merely the preferred embodiments of thepresent disclosure, and are not intended to limit the presentdisclosure. For those skilled in the art, various modifications andchanges can be made for the present disclosure. Any modifications,equivalent substitutions, improvements, etc., made within the spiritsand the principles of the present disclosure are within the protectionscope of the present disclosure.

What is claimed is:
 1. An air-conditioning system, comprising: acompressor; a first pipeline, a second pipeline, an evaporativecondenser, a first liquid separator, and a second liquid separator;wherein, the first pipeline, is in communication with the compressor;the second pipeline is in communication with a same compressor, and thefirst pipeline and the second pipeline are arranged independently; theevaporative condenser is provided in the first pipeline and the secondpipeline, and refrigerant in the first pipeline and refrigerant in thesecond pipeline perform heat exchange with the evaporative condenserrespectively; the first liquid separator is arranged in the firstpipeline, and an outlet of the first liquid separator is incommunication with the compressor; the second liquid separator isarranged in the second pipeline, and an outlet of the second liquidseparator is in communication with the compressor; and the first liquidseparator is disposed adjacent to the second liquid separator.
 2. Theair-conditioning system according to claim 1, wherein the compressorcomprises multiple cylinders, and the multiple cylinders are configuredto work independently.
 3. The air-conditioning system according to claim2, wherein the multiple cylinders comprise a first cylinder; the outletof the first liquid separator is in communication with a suction port ofthe first cylinder; a first end of the first pipeline is incommunication with a discharge port of the first cylinder; and a secondend of the first pipeline is in communication with an inlet of the firstliquid separator.
 4. The air-conditioning system according to claim 3,further comprising a condenser; wherein the condenser is arranged in thefirst pipeline; an inlet of the condenser is in communication with thedischarge port of the first cylinder; an outlet of the condenser is incommunication with a first inlet of the evaporative condenser; and afirst outlet of the evaporative condenser is in communication with theinlet of the first liquid separator.
 5. The air-conditioning systemaccording to claim 4, further comprising a first throttle valve, whereinthe first throttle valve is arranged in the first pipeline and locatedbetween the evaporative condenser and the condenser.
 6. Theair-conditioning system according to claim 3, wherein the multiplecylinders further comprise a second cylinder; wherein the outlet of thesecond liquid separator is in communication with a suction port of thesecond cylinder; a first end of the second pipeline is in communicationwith a discharge port of the second cylinder; and a second end of thesecond pipeline is in communication with an inlet of the second liquidseparator.
 7. The air-conditioning system according to claim 6, furthercomprising an evaporator, wherein the evaporator is arranged in thesecond pipeline; an inlet of the evaporator is in communication with asecond outlet of the evaporative condenser; and an outlet of theevaporator is in communication with the inlet of the second liquidseparator.
 8. The air-conditioning system according to claim 7, furthercomprising a second throttle valve, wherein the second throttle valveand is located between the evaporative condenser and the evaporator. 9.The air-conditioning system according to claim 6, wherein a volume ratioof the second cylinder to the first cylinder is T1, wherein 0.15≤T1≤0.4.10. The air-conditioning system according to claim 6, wherein a diameterratio of the suction port of the second cylinder and the suction port ofthe first cylinder is T2, wherein 0.7≤T2≤0.9.
 11. The air-conditioningsystem according to claim 6, wherein a height ratio of the secondcylinder to the first cylinder is T3, wherein 0.75≤T3≤0.95.
 12. Theair-conditioning system according to claim 1, wherein an effectivevolume ratio of the first liquid separator to the second liquidseparator is T4, wherein 2.5≤T4≤6.
 13. An air conditioner, comprisingthe air-conditioning system of claim
 1. 14. The air-conditioning systemaccording to claim 13, wherein the compressor comprises multiplecylinders, and the multiple cylinders are configured to workindependently.
 15. The air-conditioning system according to claim 14,wherein the multiple cylinders comprise a first cylinder; the outlet ofthe first liquid separator is in communication with a suction port ofthe first cylinder; a first end of the first pipeline is incommunication with a discharge port of the first cylinder; and a secondend of the first pipeline is in communication with an inlet of the firstliquid separator.
 16. The air-conditioning system according to claim 15,further comprising a condenser; wherein the condenser is arranged in thefirst pipeline; an inlet of the condenser is in communication with thedischarge port of the first cylinder; an outlet of the condenser is incommunication with a first inlet of the evaporative condenser; and afirst outlet of the evaporative condenser is in communication with theinlet of the first liquid separator.
 17. The air-conditioning systemaccording to claim 16, further comprising a first throttle valve,wherein the first throttle valve is arranged in the first pipeline andlocated between the evaporative condenser and the condenser.
 18. Theair-conditioning system according to claim 15, wherein the multiplecylinders further comprise a second cylinder; wherein the outlet of thesecond liquid separator is in communication with a suction port of thesecond cylinder; a first end of the second pipeline is in communicationwith a discharge port of the second cylinder; and a second end of thesecond pipeline is in communication with an inlet of the second liquidseparator.
 19. The air-conditioning system according to claim 18,further comprising an evaporator, wherein the evaporator is arranged inthe second pipeline; an inlet of the evaporator is in communication witha second outlet of the evaporative condenser; and an outlet of theevaporator is in communication with the inlet of the second liquidseparator.
 20. The air-conditioning system according to claim 19,further comprising a second throttle valve, wherein the second throttlevalve is arranged in the second pipeline and is located between theevaporative condenser and the evaporator.